单词拼写。

1. Going to Australia for further education for two month is a very e______ and exciting experience for me.

2. It's good manners for every one of us to show r _______ for the parents and teachers.

3. He said that he r_______ saying those words at the meeting. He wished he could take them back.

4. Make sure that you keep your manager i_______ of the fresh development by e-mail.

5. Your success in passing the exam will be a great _______ (满意) to your parents.

6. Reducing the gap between the rich and the poor is one of the _______ (挑战) facing the government.

7. After ______ (毕业) from university, he went to China to study Chinese.

8. The man was badly injured, so he must be sent to the hospital _______ (立即).

9. Mr. Brown often ______ (鼓励) his children to solve problems by themselves.

10. He was shaking her hand before I could finish the ______ (介绍).

用兆欧表测量电动机的绝缘电阻，应选用兆欧表的额定电压是（）

A.250V

B.500V

C.1000V

D.2500V